Nanomaterials
·
2021
·Vol. 11
·期 6
·1531
·
IF 5.076
Haoxian Chen,Jiayi Wang,Yan Zhao,Qindan Zeng,Guofu Zhou,Mingliang Jin
The severe shuttle effect of soluble polysulfides hinders the development of lithium–sulfur batteries. Herein, we develop a three-dimensionally ordered macro/mesoporous (3DOM) Nb2O5/Nb4N5heterostructure, which combines the strong adsorption of Nb2O5and remarkable catalysis effect of Nb4N5by the promotion “adsorption-transformation” mechanism in sulfur reaction. Furthermore, the high electrocatalytic activity of Nb4N5facilitates ion/mass transfer during the charge/discharge process. As a result, cells with the S-Nb2O5/Nb4N5electrode delivered outstanding cycling stability and higher discharge capacity than its counterparts. Our work demonstrates a new routine for the multifunctional sulfur host design, which offers great potential for commercial high-performance lithium–sulfur batteries.Keywords:Nb2O5;Nb4N5;heterostructure;lithium-sulfur batteries
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2015
·Vol. 2
·期 12
·1500126
·
IF 0
Houlei Cui,Guilian Zhu,Xiangye Liu,Fengxin Liu,Yian Xie,Chongyin Yang,Tianquan Lin,Hui Gu,Fuqiang Huang
Supercapacitors suffer either from low capacitance for carbon or derivate electrodes or from poor electrical conductivity and electrochemical stability for metal oxide or conducting polymer electrodes. Transition metal nitrides possess fair electrical conductivity but superior chemical stability, which may be desirable candidates for supercapacitors. Herein, niobium nitride, Nb 4 N 5 , is explored to be an excellent capacitive material for the first time. An areal capacitance of 225.8 mF cm −2 , with a reasonable rate capability (60.8% retention from 0.5 to 10 mA cm −2 ) and cycling stability (70.9% retention after 2000 cycles), is achieved in Nb 4 N 5 nanochannels electrode with prominent electrical conductivity and electrochemical activity. Faradaic pseudocapacitance is confirmed by the mechanistic studies, deriving from the proton incorporation/chemisorption reaction owing to the copious +5 valence Nb ions in Nb 4 N 5 . Moreover, this Nb 4 N 5 nanochannels electrode with an ultrathin carbon coating exhibits nearly 100% capacitance retention after 2000 CV cycles, which is an excellent cycling stability for metal nitride materials. Thus, the Nb 4 N 5 nanochannels are qualified for a candidate for supercapacitors and other energy storage applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Liyan Liu,Meihui Tan,Huiyuan Liu,Weiqi Zhang,Qian Xu,Khadijeh Hooshyari,Jiao Yu,Huaneng Su
Abstact The stability of support materials is crucial for the application of high temperature polymer electrolyte membrane fuel cells (HT-PEMFCs), and the corrosion of conventional carbon support poses a significant challenge. In this study, a new type of composite support material, carbon composite niobium nitride (Nb4N5/C) was developed and investigated. Physical characterization demonstrated that Nb4N5 has a unique micro-flower morphology with a large specific surface area , making it an ideal support for Pt nanoparticles . X-ray photoelectron spectroscopy (XPS) analysis revealed that the addition of Nb4N5 reduced the displacement of d-band center of Pt and weakened the bonding between adsorbed oxygen and Pt. The Pt/Nb4N5/C-based catalyst demonstrated better stability than Pt/C after undergoing an accelerated durability test (ADT) of 5000 cycles, indicating the effectiveness of introducing this transition metal nitrides (TMNs) to enhance catalyst stability. Moreover, in the single-cell test at high temperature, the HT-PEMFC based on the Pt/Nb4N5/C catalyst exhibited an impressive peak power density of 520.48 mW cm−2 at 150 °C. After the durability test, it only suffered a decrease of 5.2%, which is more stable than the commercial Pt/C (11.7%), suggesting it is promising candidate for practical HT-PEMFC applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 13
·1015
·
IF 4.3
Xialei Li,Wen Shang,Shan Zhang,Chun Xu,Jiabiao Lian,Guochun Li
Lithium–sulfur (Li-S) batteries are hindered by the sluggish electrochemical kinetics and poor reversibility of lithium polysulfides (LiPSs), which limits their practical energy density and cycle life. In order to address this issue, a novel Ni3N/Nb4N5heterostructure was synthesized via electrospinning and nitridation as a functional coating for polypropylene (PP) separators. Adsorption experiments were conducted in order to ascertain the heterostructure’s superior affinity for LiPSs, thereby effectively mitigating their shuttling. Studies of Li2S nucleation demonstrated the catalytic role of the substance in accelerating the deposition kinetics of Li2S. Consequently, Li-S cells that employed the Ni3N/Nb4N5-modified separator were found to achieve significantly enhanced electrochemical performance, with the cells delivering an initial discharge capacity of 1294.4 mAh g−1at 0.2 C. The results demonstrate that, after 150 cycles, the cells retained a discharge capacity of 796.2 mAh g−1, corresponding to a low capacity decay rate of only 0.25% per cycle. In addition, the rate capability of the cells was found to be improved in comparison to control cells with NiNb2O6-modified or pristine separators.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 84
·81290-81295
·
IF 3.289
Chenlong Dong,Xin Wang,Xiangye Liu,Xiaotao Yuan,Wujie Dong,Houlei Cui,Yuhang Duan,Fuqiang Huang
The metal-rich niobium nitride of Nb4N5 has higher conductivity than Nb3N5 and a higher theoretical specific capacity than NbN. To rationally design a metal-rich anode material, Nb4N5 nanocrystals coated by nitrogen-doped graphene (N-G) have been successfully synthesized by a facile in situ ice bathing method with subsequent annealing in NH3. The use of these as an anode material is reported for the first time. The discharge capacity is 487 mA h g−1 at the current density of 0.1 A g−1 (0.0819 mA cm−2) after 200 cycles and the high rate discharge capacity is 125 mA h g−1 at a current density of 5 A g−1 (4.0926 mA cm−2). Specially, the discharge capacity is still enhanced after 200 cycles at 0.1 A g−1 (0.0819 mA cm−2). The Nb4N5/N-G hybrid could be a promising anode material for LIBs with a high rate performance and long cycle life.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）